[PATCH v3 2/4] lxc: add LXC version 3 network parser

[Daniel P. Berrangé]

On Tue, Jan 28, 2020 at 10:54:09PM -0300, Julio Faracco wrote:
> LXC version 3 or higher introduced indexes for network interfaces.
> Libvirt should be able to parse entries like `lxc.net.2.KEY`. This
> commit adds functions to parse this type of field. That's why array
> structures are so important this time.
> 
> Signed-off-by: Julio Faracco <jcfaracco at gmail.com>
> ---
>  src/lxc/lxc_native.c | 51 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 51 insertions(+)
> 
> diff --git a/src/lxc/lxc_native.c b/src/lxc/lxc_native.c
> index b101848c09..35ac05f702 100644
> --- a/src/lxc/lxc_native.c
> +++ b/src/lxc/lxc_native.c
> @@ -649,6 +649,55 @@ lxcNetworkParseDataSuffix(const char *entry,
>  }
>  
>  
> +static lxcNetworkParseDataPtr
> +lxcNetworkGetParseDataByIndex(lxcNetworkParseDataArray *networks,
> +                              unsigned int index)
> +{
> +    size_t ndata = networks->ndata;
> +    size_t i;
> +
> +    for (i = 0; i < ndata; i++) {
> +        if (networks->parseData[i]->index == index)
> +            return networks->parseData[i];
> +    }
> +
> +    /* Index was not found. So, it is time to add new *
> +     * interface and return this last position.       */
> +    if (VIR_EXPAND_N(networks->parseData, networks->ndata, 1) < 0)
> +        return NULL;
> +
> +    networks->parseData[ndata] = g_new0(lxcNetworkParseData, 1);
> +    networks->parseData[ndata]->index = index;
> +
> +    return networks->parseData[ndata];
> +}
> +
> +
> +static int
> +lxcNetworkParseDataEntry(const char *name,
> +                         virConfValuePtr value,
> +                         lxcNetworkParseDataArray *networks)
> +{
> +    lxcNetworkParseData *parseData;
> +    const char *suffix_tmp = STRSKIP(name, "lxc.net.");
> +    g_autofree char *suffix = NULL;

Actually your  v2 PATCH was right.  The 'suffix' variable is
not a newly allocated string - it is just a pointer to an
offset in the original string.

> +    unsigned long long index;
> +
> +    if (virStrToLong_ull(suffix_tmp, &suffix, 10, &index) < 0)
> +        return -1;
> +
> +    if (suffix[0] != '.')
> +        return -1;
> +
> +    suffix++;
> +
> +    if (!(parseData = lxcNetworkGetParseDataByIndex(networks, index)))
> +        return -1;
> +
> +    return lxcNetworkParseDataSuffix(suffix, value, parseData);
> +}
> +

Regards,
Daniel
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